Hi, Anjou~
My favorite thing to cook in our cast-iron dutch oven is chicken. It's easy ~ Heat some oil in your dutch oven on top of the stove and brown the chicken, breast down, for a couple of minutes ~ flip it over and while it is browning on the back side, season it as desired. You can use cajun seasoning, chili powder, etc. for that rotisserie chicken flavor, or just salt & pepper ~ whatever you like. Pour about 1/4 cup cooking wine over the top, put the lid on, and stick it in the oven for about 1 1/2 to 2 hrs at 350. Very quick and easy, and absolutely the juiciest roasted chicken I've ever had!
Enjoy your dutch oven! I look forward to others' ideas, too.
~Polly